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QUANTITATIVE VARIATION OF 20‐HYDROXYECDYSONE IN THE NYMPH OF DERMACENTOR NIVEUS NEUMANN *
Author(s) -
Liu Jingze,
Jiang Zaijie,
Yun Zihou,
Yang Yiping
Publication year - 1995
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1744-7917.1995.tb00060.x
Subject(s) - nymph , biology , moulting , period (music) , zoology , botany , larva , physics , acoustics
The variation of 20‐hydroxyecdysone (20 E) levels in the unfed, feeding and engorged nymphs of Dermacentor niveus was studied. The results showed that 20 E existed in all stages of nymphal development. There were two peaks. A small peak (2. 34 ng/nymph) appeared in the feeding period (5 days after attachment) which was connected with the fast feeding before dropping from the host, and a big peak (16.17 ng/nymph) in the moulting period (8 days after engorgement). The latter might be correlated with epicuticle deposition. From the 6th day to the 8th day after engorgement, the level of 20 E rose rapidly. Apolysis occurred in this period.